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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
76369139 FW |
2 | #ifndef _KERNEL_EVENTS_INTERNAL_H |
3 | #define _KERNEL_EVENTS_INTERNAL_H | |
4 | ||
9251f904 | 5 | #include <linux/hardirq.h> |
91d7753a | 6 | #include <linux/uaccess.h> |
9251f904 BP |
7 | |
8 | /* Buffer handling */ | |
9 | ||
76369139 FW |
10 | #define RING_BUFFER_WRITABLE 0x01 |
11 | ||
12 | struct ring_buffer { | |
13 | atomic_t refcount; | |
14 | struct rcu_head rcu_head; | |
15 | #ifdef CONFIG_PERF_USE_VMALLOC | |
16 | struct work_struct work; | |
17 | int page_order; /* allocation order */ | |
18 | #endif | |
19 | int nr_pages; /* nr of data pages */ | |
dd9c086d | 20 | int overwrite; /* can overwrite itself */ |
86e7972f | 21 | int paused; /* can write into ring buffer */ |
76369139 FW |
22 | |
23 | atomic_t poll; /* POLL_ for wakeups */ | |
24 | ||
25 | local_t head; /* write position */ | |
26 | local_t nest; /* nested writers */ | |
27 | local_t events; /* event limit */ | |
28 | local_t wakeup; /* wakeup stamp */ | |
29 | local_t lost; /* nr records lost */ | |
30 | ||
31 | long watermark; /* wakeup watermark */ | |
1a594131 | 32 | long aux_watermark; |
10c6db11 PZ |
33 | /* poll crap */ |
34 | spinlock_t event_lock; | |
35 | struct list_head event_list; | |
76369139 | 36 | |
9bb5d40c PZ |
37 | atomic_t mmap_count; |
38 | unsigned long mmap_locked; | |
26cb63ad PZ |
39 | struct user_struct *mmap_user; |
40 | ||
45bfb2e5 | 41 | /* AUX area */ |
2ab346cf | 42 | long aux_head; |
fdc26706 | 43 | local_t aux_nest; |
d9a50b02 | 44 | long aux_wakeup; /* last aux_watermark boundary crossed by aux_head */ |
45bfb2e5 PZ |
45 | unsigned long aux_pgoff; |
46 | int aux_nr_pages; | |
2023a0d2 | 47 | int aux_overwrite; |
45bfb2e5 PZ |
48 | atomic_t aux_mmap_count; |
49 | unsigned long aux_mmap_locked; | |
50 | void (*free_aux)(void *); | |
51 | atomic_t aux_refcount; | |
52 | void **aux_pages; | |
53 | void *aux_priv; | |
54 | ||
76369139 FW |
55 | struct perf_event_mmap_page *user_page; |
56 | void *data_pages[0]; | |
57 | }; | |
58 | ||
76369139 | 59 | extern void rb_free(struct ring_buffer *rb); |
57ffc5ca PZ |
60 | |
61 | static inline void rb_free_rcu(struct rcu_head *rcu_head) | |
62 | { | |
63 | struct ring_buffer *rb; | |
64 | ||
65 | rb = container_of(rcu_head, struct ring_buffer, rcu_head); | |
66 | rb_free(rb); | |
67 | } | |
68 | ||
86e7972f WN |
69 | static inline void rb_toggle_paused(struct ring_buffer *rb, bool pause) |
70 | { | |
71 | if (!pause && rb->nr_pages) | |
72 | rb->paused = 0; | |
73 | else | |
74 | rb->paused = 1; | |
75 | } | |
76 | ||
76369139 FW |
77 | extern struct ring_buffer * |
78 | rb_alloc(int nr_pages, long watermark, int cpu, int flags); | |
79 | extern void perf_event_wakeup(struct perf_event *event); | |
45bfb2e5 | 80 | extern int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event, |
1a594131 | 81 | pgoff_t pgoff, int nr_pages, long watermark, int flags); |
45bfb2e5 | 82 | extern void rb_free_aux(struct ring_buffer *rb); |
fdc26706 AS |
83 | extern struct ring_buffer *ring_buffer_get(struct perf_event *event); |
84 | extern void ring_buffer_put(struct ring_buffer *rb); | |
45bfb2e5 PZ |
85 | |
86 | static inline bool rb_has_aux(struct ring_buffer *rb) | |
87 | { | |
88 | return !!rb->aux_nr_pages; | |
89 | } | |
76369139 | 90 | |
68db7e98 AS |
91 | void perf_event_aux_event(struct perf_event *event, unsigned long head, |
92 | unsigned long size, u64 flags); | |
93 | ||
76369139 FW |
94 | extern struct page * |
95 | perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff); | |
96 | ||
97 | #ifdef CONFIG_PERF_USE_VMALLOC | |
98 | /* | |
99 | * Back perf_mmap() with vmalloc memory. | |
100 | * | |
101 | * Required for architectures that have d-cache aliasing issues. | |
102 | */ | |
103 | ||
104 | static inline int page_order(struct ring_buffer *rb) | |
105 | { | |
106 | return rb->page_order; | |
107 | } | |
108 | ||
109 | #else | |
110 | ||
111 | static inline int page_order(struct ring_buffer *rb) | |
112 | { | |
113 | return 0; | |
114 | } | |
115 | #endif | |
116 | ||
9251f904 | 117 | static inline unsigned long perf_data_size(struct ring_buffer *rb) |
76369139 FW |
118 | { |
119 | return rb->nr_pages << (PAGE_SHIFT + page_order(rb)); | |
120 | } | |
121 | ||
45bfb2e5 PZ |
122 | static inline unsigned long perf_aux_size(struct ring_buffer *rb) |
123 | { | |
124 | return rb->aux_nr_pages << PAGE_SHIFT; | |
125 | } | |
126 | ||
aa7145c1 | 127 | #define __DEFINE_OUTPUT_COPY_BODY(advance_buf, memcpy_func, ...) \ |
91d7753a FW |
128 | { \ |
129 | unsigned long size, written; \ | |
130 | \ | |
131 | do { \ | |
0a196848 | 132 | size = min(handle->size, len); \ |
aa7145c1 | 133 | written = memcpy_func(__VA_ARGS__); \ |
0a196848 | 134 | written = size - written; \ |
91d7753a FW |
135 | \ |
136 | len -= written; \ | |
137 | handle->addr += written; \ | |
aa7145c1 DB |
138 | if (advance_buf) \ |
139 | buf += written; \ | |
91d7753a FW |
140 | handle->size -= written; \ |
141 | if (!handle->size) { \ | |
142 | struct ring_buffer *rb = handle->rb; \ | |
143 | \ | |
144 | handle->page++; \ | |
145 | handle->page &= rb->nr_pages - 1; \ | |
146 | handle->addr = rb->data_pages[handle->page]; \ | |
147 | handle->size = PAGE_SIZE << page_order(rb); \ | |
148 | } \ | |
149 | } while (len && written == size); \ | |
150 | \ | |
151 | return len; \ | |
152 | } | |
153 | ||
7e3f977e DB |
154 | #define DEFINE_OUTPUT_COPY(func_name, memcpy_func) \ |
155 | static inline unsigned long \ | |
156 | func_name(struct perf_output_handle *handle, \ | |
157 | const void *buf, unsigned long len) \ | |
aa7145c1 | 158 | __DEFINE_OUTPUT_COPY_BODY(true, memcpy_func, handle->addr, buf, size) |
7e3f977e DB |
159 | |
160 | static inline unsigned long | |
161 | __output_custom(struct perf_output_handle *handle, perf_copy_f copy_func, | |
162 | const void *buf, unsigned long len) | |
aa7145c1 DB |
163 | { |
164 | unsigned long orig_len = len; | |
165 | __DEFINE_OUTPUT_COPY_BODY(false, copy_func, handle->addr, buf, | |
166 | orig_len - len, size) | |
167 | } | |
7e3f977e | 168 | |
0a196848 PZ |
169 | static inline unsigned long |
170 | memcpy_common(void *dst, const void *src, unsigned long n) | |
76369139 | 171 | { |
91d7753a | 172 | memcpy(dst, src, n); |
0a196848 | 173 | return 0; |
76369139 FW |
174 | } |
175 | ||
91d7753a FW |
176 | DEFINE_OUTPUT_COPY(__output_copy, memcpy_common) |
177 | ||
0a196848 PZ |
178 | static inline unsigned long |
179 | memcpy_skip(void *dst, const void *src, unsigned long n) | |
180 | { | |
181 | return 0; | |
182 | } | |
5685e0ff | 183 | |
0a196848 | 184 | DEFINE_OUTPUT_COPY(__output_skip, memcpy_skip) |
5685e0ff | 185 | |
91d7753a | 186 | #ifndef arch_perf_out_copy_user |
0a196848 PZ |
187 | #define arch_perf_out_copy_user arch_perf_out_copy_user |
188 | ||
189 | static inline unsigned long | |
190 | arch_perf_out_copy_user(void *dst, const void *src, unsigned long n) | |
191 | { | |
192 | unsigned long ret; | |
193 | ||
194 | pagefault_disable(); | |
195 | ret = __copy_from_user_inatomic(dst, src, n); | |
196 | pagefault_enable(); | |
197 | ||
198 | return ret; | |
199 | } | |
91d7753a FW |
200 | #endif |
201 | ||
202 | DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user) | |
203 | ||
9251f904 | 204 | /* Callchain handling */ |
e6dab5ff AV |
205 | extern struct perf_callchain_entry * |
206 | perf_callchain(struct perf_event *event, struct pt_regs *regs); | |
9251f904 BP |
207 | |
208 | static inline int get_recursion_context(int *recursion) | |
209 | { | |
210 | int rctx; | |
211 | ||
d0618410 | 212 | if (unlikely(in_nmi())) |
9251f904 BP |
213 | rctx = 3; |
214 | else if (in_irq()) | |
215 | rctx = 2; | |
216 | else if (in_softirq()) | |
217 | rctx = 1; | |
218 | else | |
219 | rctx = 0; | |
220 | ||
221 | if (recursion[rctx]) | |
222 | return -1; | |
223 | ||
224 | recursion[rctx]++; | |
225 | barrier(); | |
226 | ||
227 | return rctx; | |
228 | } | |
229 | ||
230 | static inline void put_recursion_context(int *recursion, int rctx) | |
231 | { | |
232 | barrier(); | |
233 | recursion[rctx]--; | |
234 | } | |
235 | ||
c5ebcedb JO |
236 | #ifdef CONFIG_HAVE_PERF_USER_STACK_DUMP |
237 | static inline bool arch_perf_have_user_stack_dump(void) | |
238 | { | |
239 | return true; | |
240 | } | |
241 | ||
242 | #define perf_user_stack_pointer(regs) user_stack_pointer(regs) | |
243 | #else | |
244 | static inline bool arch_perf_have_user_stack_dump(void) | |
245 | { | |
246 | return false; | |
247 | } | |
248 | ||
249 | #define perf_user_stack_pointer(regs) 0 | |
250 | #endif /* CONFIG_HAVE_PERF_USER_STACK_DUMP */ | |
251 | ||
76369139 | 252 | #endif /* _KERNEL_EVENTS_INTERNAL_H */ |